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arXiv · 2604.25090

Can LLP detectors probe the reheating temperature? A case study of vector dark matter

Paulo Areyuna C·Giovanna Cottin·Bastián Díaz Sáez·Zeren Simon Wang·Yu Zhang
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Abstract

We study an extension of the singlet-scalar Higgs portal featuring a dark vector $V_\mu$ and a real scalar $\phi$. The vector is a dark matter (DM) candidate, while $\phi$ is long-lived and decays via higher-dimensional operators. We explore the DM production via freeze-in at low and high reheating temperatures. At colliders, the decay $\phi\to Z+V$ yields distinctive long-lived particle (LLP) signatures. We explore the interplay between cosmological constraints and LLP searches at the LHC and FCC-hh, showing that far detectors can probe otherwise inaccessible parameter space and place novel bounds on the reheating temperature.

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Paulo Areyuna C, Giovanna Cottin, Bastián Díaz Sáez, Zeren Simon Wang, Yu Zhang. 2026-04-28. Can LLP detectors probe the reheating temperature? A case study of vector dark matter. https://arxiv.org/abs/2604.25090

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